英文:
GoLang: Allocating Slice of Slices in functions results in index out of range
问题
我一直在尝试一些Go语言的东西，但遇到了一个无法解决的问题。
当代码执行到useSliceStruct函数时，第一次调用AllocateSlice()时会出现索引超出范围的错误。
据我所知，这两个方法的代码是相同的。那么我错过了什么？
英文:
I've been trying some things out in Go and I've hit a problem that I can't figure out.
package main
import "fmt"
import "strconv"
func writeHello(i int, ) {
fmt.Printf("hello, world "+strconv.Itoa(i)+"\n")
}
type SliceStruct struct {
data [][]int;
}
func (s SliceStruct) New() {
s.data=make([][]int,10);
}
func (s SliceStruct) AllocateSlice(i int) {
s.data[i]=make([]int,10);
}
func (s SliceStruct) setData(i int, j int, data int) {
s.data[i][j] = data;
}
func (s SliceStruct) getData(i int, j int) int {
return s.data[i][j]
}
func useSliceStruct(){
sliceStruct := SliceStruct{};
sliceStruct.New();
for i := 0; i < 10; i++ {
sliceStruct.AllocateSlice(i);
for j:=0; j<10; j++ {
sliceStruct.setData(i,j,i);
writeHello(sliceStruct.getData(i,j));
}
}
}
func dontUseSliceStruct(){
data:=make([][]int,10);
for i := 0; i < 10; i++ {
data[i]=make([]int,10);
for j:=0; j<10; j++ {
data[i][j] = i;
writeHello(data[i][j]);
}
}
}
func main() {
dontUseSliceStruct();
useSliceStruct();
}
When it gets to the function useSliceStruct, the code fails at the first call to AllocateSlice() with an index out of range error.
As far as I can tell the code for the two methods does idential things. So what am I missing?
答案1
得分: 1
DOH，刚刚解决了。
在函数声明中，我没有使用结构体的引用。
func (s SliceStruct)
应该是
func (s *SliceStruct)
英文:
DOH, just worked it out.
I wasn't using a reference to the struct in the function declarations.
func (s SliceStruct)
Should have been
func (s *SliceStruct)
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